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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | $ 57,210 | $ 29,404
Less than 12 months, Unrealized losses | (642) | (464)
12 months or longer, Fair value | 529,564 | 596,986
12 months or longer, Unrealized losses | (50,143) | (70,851)
U.S. government obligations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 0 | 9,045
Less than 12 months, Unrealized losses | 0 | (108)
12 months or longer, Fair value | 2,774 | 6,811
12 months or longer, Unrealized losses | (332) | (569)
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 30,149 | 1,387
Less than 12 months, Unrealized losses | (159) | (9)
12 months or longer, Fair value | 326,540 | 365,893
12 months or longer, Unrealized losses | (24,410) | (37,088)
Mortgage-backed and asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 26,770 | 18,150
Less than 12 months, Unrealized losses | (480) | (316)
12 months or longer, Fair value | 189,663 | 216,220
12 months or longer, Unrealized losses | (24,350) | (31,967)
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 291 | 293
Less than 12 months, Unrealized losses | (3) | (1)
12 months or longer, Fair value | 9,467 | 7,010
12 months or longer, Unrealized losses | (961) | (1,069)
Redeemable preferred stock |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Fair value | 0 | 529
Less than 12 months, Unrealized losses | 0 | (30)
12 months or longer, Fair value | 1,120 | 1,052
12 months or longer, Unrealized losses | $ (90) | $ (158)

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